Structural data preprocessing and analysis for this study was performed with the VBM8 toolbox (http://dbm.neuro.uni-jena.de/vbm/) within the Statistical Parametric Mapping software SPM8 (Wellcome Department of Imaging Neuroscience, Institute of Neurology and the National Hospital for Neurology and Neurosurgery; London, England; http://www.fil.ion.ucl.ac.uk/spm/) running on MATLAB R2014a (Mathworks).
